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ThisIsMySig · June 20, 2012, 04:32 PM

Hey guys,

When comparing load data from two different manuals for a 125 grain 9mm LCN, I see the following:

My Lyman's second edition shows a CUP value of 27,600 from 3.2 grains of 231 with a velocity of 946 fps from an OAL of 1.115. The Hodgdon site indicates a CUP of 25,700 from 3.9 grains of 231 with a velocity of 1009 fps from an OAL of 1.125.

The CUP from Lyman's is higher with less of a charge than what the Hodgdon site indicates from a heavier charge. Is it possible that the difference in OAL is responsible for what appears to be a discrepancy?

June 20, 2012, 04:32 PM	#1
ThisIsMySig Member Join Date: June 6, 2012 Location: Apache Junction, Arizona Posts: 65	Difference in CUP between two sources Hey guys, When comparing load data from two different manuals for a 125 grain 9mm LCN, I see the following: My Lyman's second edition shows a CUP value of 27,600 from 3.2 grains of 231 with a velocity of 946 fps from an OAL of 1.115. The Hodgdon site indicates a CUP of 25,700 from 3.9 grains of 231 with a velocity of 1009 fps from an OAL of 1.125. The CUP from Lyman's is higher with less of a charge than what the Hodgdon site indicates from a heavier charge. Is it possible that the difference in OAL is responsible for what appears to be a discrepancy? __________________ Sig P250 in 9mm and .45 cal, Sig 1911 .22LR, Heritage Arms 32 H&R Magnum revolver, S&W Governor. Reloading 9mm, 32 magnum, 45 ACP, 45 LC and 410 bore brass. NRA Member